Crossword Genius

Curved line (3)

Ross

I believe the answer is:

arc

'curved line' is the definition.
(an arc is a part of a curved line)

This is all the clue.

(Other definitions for arc that I've seen before include "Rainbow, e.g." , "Bow" , "Semi-circle" , "Something used to weld" , "Part of a circular line" .)

I've seen this clue in the USA Today, the Newsday, The Guardian, The Times, the Penny Press and the King Feature Syndicate.
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